M1 is connected to M2 with a rigid string. Both sits on a leveled ground of uk=0.25 with M3 sitting on top of M2.  When a force F 25 N pulls on M1 forward with an angle 30.0 degrees with respect to the ground, all three blocks move at the same acceleration. (M1= 3.0 kg, M2=2.0 kg, M3=1.0 kg) a. draw a free body diagram of each block, b. what is the normal force and friction on M1 ? c. what is the acceleration of the system (M1+M2+M3)?  d. use work and Kinetic theory to find the speed of the system at the time all blocks have traveled a displacement of 5.0 m.

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The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”